A) 2.4 cm
B) 1.2 cm
C) 2.4 mm
D) 1.2 mm
Correct Answer: C
Solution :
: For diffraction, when the pattern is obtained on a screen at distance\[(f)\], \[\frac{x}{f}=\frac{\lambda }{a}\] or\[x=\frac{f\lambda }{a}=\]Distance of first dark fringe from axis. \[\therefore \] = 0.12 cm = 1.2 mm \[\therefore \]\[2x=\]Distance between the first dark fringes on either side of the central bright fringe \[\therefore \]Distance\[=2.4\text{ }mm\]You need to login to perform this action.
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